Improvement in mortisinq-machines



Il4 FETES. PH GRAPIIER, WASHINGTON D C die ritmi time D. L. GIBBS, OFWORCESTER, MASSACHUSETTS, ASSIGNOB TO R. BALL vAND COMPANY, OF SAMEPLACE.

Letters Patent No. 86,389, dated February 2, 1869.

IMPROVEMENT IN MORTISING-MACHINES.

The Schedule referred to in these Letters Patent and making part of thesame.

Know all men by these presents That I, D L. GIBBS, of the city andcounty of Worcester, and Commonwealth of Massachusetts, have inventedcertain new and useful Improvements iii Mortising-Machines; and I dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to theaccompanyingdrawings, forming a part of this specification, in which-Figure 1 represents a front View of my improvements inmcrtising-machines.

Figure 2 represents a view of the right-hand side of my improvedmortising-machine.

Figure 3 represents a rear View of the same.

Figure 4 represents a central section on line A B, fig. 1.

Figure 5 represents a horizontal section on line C D, lig. 2.

Figure 6 represents a plan view ot tnechain-wheel and hand-lever, thewheel being made somewhat differently from the one shown in the previousdrawings.

Figure 7 repr'esents a front view ofthe chain-wheel and hand-lever shownin lig. 6.

To enable those ,skilled in the art to which my invention belongs, tomake and use the same, I will proceed to describe it more in detail,

The nature of my invention consists- First, in the peculiar combinationand arrangement of devices for turning or reversing the chisel, ashereafter described.

Second, in the arrangement of mechanism, as hereafter described, forreversing the chisel in mortising-l machines, so that the same may beoperated either by power or by hand.

Third, in the arrangement of certain devices, in the peculiar mannershown and described, for connecting the treadle-rod to the treadle,whereby the length ot' the -stroke may be regulated, as hereafter setforth.

-Fourth, in the arrangement, in a power-mortising machine, of thedevices shown in the drawings, as and for the purposes ,hereafterdescribed.

In the drawings, the part marked A is the main frame,B, thedriving-shaft, and G, the crank-wheel, all of which are constructed inthe /usual form and manner, and will therefore need no furtherexplanation.

Upon the front part ofthe main frame A is arranged the slide D, carryingthe chisel-spindle E, theaformer being operated up and down, between itsguides F, by means of the connecting-rod G from the crank-wheel G.

The chisel-spindle Eis supported by bearings D', projecting from theslide D, and bearings H are secured to the faces ofthe guides F, whichsupport the beltor chain-wheel K, by means of which the chiselspindle Eis reversed.

The chain-wheel K is furnished with a spline, which titsinto alongitudinal groove out in the side ofthe spindle E, and its outersurface may be madewith agroove around it, as shown in g. 4, or withprojecting points a, as indicated in gs. 6 and 7, to it betweenthe linksofthe chain, and prevent it from slipping upon the surface ofthe wheel,when a chain is used.

Below the pointed or grooved portion, in theface of the wheel K, atopposite points, are formed two notches, c, into which the end 2 of acatch-lever, I, enters, to hold the wheel K and chisel-spindle E inposition while the mortises are being cut.

A hole, b, is also made in the face of the chainwheel, to receive thehandle d, when it is desired to reverse the chisel by hand.

Pins are placed in the notches c toreceive the wear causedby the end 2of the catch-lever I, and they can be easily replaced when `worn out.

rLhe catch-lever I is hung upon a pivot,c, secured in the side of themain frame A, and made adjustable by a'set-screw, f.

The ,upper end of lever I is projected backward, forming a beak, g, andthe lowerend, 2, projects forward, and passes through a slot cut forthat purpose in `the slide D, where it is held in contact'with thechain-wheel K,by means of a spring, J, secured to the front of the mainframe A, and resting against the top end of the lever I, all of which isfully. indicated in the drawings.

In the interior of the main frame A, near the back,

is placed a pulley, L, having, in this instance, upon its surfaceseveral grooves, and when the pointed chainwheel is used, it also hasrows cfpoints similar to those upon said wheel.

The pulley turns upon a stud, M, secured to a forked support, N, by anut, M, and by means of which the stud M may be adjusted back and forth,to tighten the belt, or chain m, which transmits motion from the pulleyL- to the chain-wheel K and chisel-spindle E.

The forked support N is secured to the mainframe A, and made adjustableup and down by having fastened to its rear end, slotted ears N', whichextend out, ward upon the back of the frame A, and through which passbolts or screws It, as indicated in the drawings.

The pulley L derives its motion from a pulley, 0, upon the driving-shaftB, by means of a belt, p, which passes down under grooved pulleys u,placed at the sides of a stud, P, which projects from the rear of themachine.

The stud P is cast upon a plate, O', that-is formed with slots i,through which the bolts or screws k pass, that secure it to the mainframe A, and it is thereby made adjustable.

Holding-pins, 2:, are placed in the sides of the stud P, outside thegrooved pulleys n, to prevent the `belt p from being thrown oi.

Secured to the treadle-rod Q, which connects the treadle R with thebearing f1-ame, B', of the drivingshaft B, isan adjustable collar, orslide, S, to the top side Aof which is pivoted a dog, t, as shown iniig. 4.

When the trcadle-rod is moved down, the point of the dog rises, whichallows it to pass freely by the beak g, at the end of the catchdever I,butwhen the treadle- `rod'Q rises, the point of the dog engages the beakg,

and throws it forward, which operation moves the lower end of thecatch-lever I out of the notch c. upon the chain-wheel K, and allows itto turn.

rIhe lower end, 2, of the catchlever I, may also be moved back by thehand-lever T, which is pivoted to the plate U, fastened to the sideofthe main frame A, through which the hand-lever 'l passes, with its endresting against the front side of the catch-lever I, and` by means ofwhi'ch the latter can be held back, by drawing the outer end of thehand-lever T forward, and retaining it in that position by the latch w,as indicated in red lines, fig. 5.

Projecting from each side of the main frame A are latch-pieces u, whichhold the chisel in position when the reversing is performed by hand,with the handle d. At the lower end'of the treadle-rod Q is a collar, V,agains'twhich presses the Ispring S', which holds the working-parts ofthe-machine in an elevated position.

An adjusting-device is arranged at the lower end of the treadle-rod Q,which consists of two metallic plates, W and Z, one of which is attachedto the end of the treadle-rod Q, and the other is pivoted to the treadleR.

Their joining faces are serrated, and they are clamped together by abolt or screw, y, the plate Z being slotted to admit of itsbeing clampedin different positions, to adjust the tieadle to the desired position tobe operated conveniently, and with the greatest ease to the operator,while cutting mortises of different depths.

When the mortises to be cut are of great depth, a long stroke ofthevtreadle is required; therefore the plates W and Z are clampedtogether, with'the lever at the highest position to which it can beraised, thus giving the full sweep of the treadle from top. togbottom oftheopening. But when the lnortises are to beshallow, the plates W and Zare clamped with the treadle, but partially raised, according to thedepth of inortise required, thereby obviating the necessity of theoperator raising his foot any higher than is actually required to clearthe chisel from the mortise. In this manner much time and labor aresaved.

Bars 3 are arranged across the interior of the frame A, to prevent thetreadle-rod Qfrom springing, and allowing the dog t to pass the beakofthe catchlever without engaging and operating it.

The operation is as follows:

The machine being in motion, theetreadl'eR is pressed down, which allowsthe dog t to pass beneath the beak g of lever I, and also loosens thebelt p. Then, when the mortise is cut far enough in that direction, thepressure is' removed from the treadle R., and the driving-shaft andpulley O being raised by the power of the springs S, the belt p istightened, so that it will operate pulley L, and at `the same time' thedog t, in passing the beak g, throws the lower end, 2, of thecatch-lever I, for an instant, out of the notch c in the chain-wheelK,whicl1 is, with the spindle E, turned by means of the belt or chain m,around until the catch-lever I enters the next notch upon the face ofthe chain-wheel K, which being at the opposite side, reverses thechisel-spindle E and chisel.

When, from accident or otherwise, it becomes necessary to reverse thechisel by hand, vthe belt or chain lm is thrown 'off from thechain-wheel K, the catch-lever I is latched back, and the handle dscrewed into the opening b, as shown in red lines, iig. 5. rlhen, bymoving. the handle d from side :to side, the chisel-spindleY asindicated by red lines,riig`.' 5., and the chisel will be automaticallyreversed, by means of beltp and belt or chain m., operating as beforeexplained.

Having described my improvements in mortisingmachines,

What I claim therein as new, and of my invention, and desire to secureby Letters Patent, is

1. The combination, with the chisel-spindle E, and pulley K, and belt orchain ym, ofthe pulley L and belt j), substantially as and for thepurposes stated.

2. The combination, with pulley L, frooved pulleys n, and driving-shaftB, of the belt p, substantially as and for the purposes set forth.

3. The combination, with belt p and grooved pulleys n, of holding-pinsac, as and for the purposes shown and described.

4. Ihe arrangement of the spindle E and wheel K with catch-lever I andspring J, substantially as and for the purposes stated.

5. The combination, with treadle-rod Q and catchleverlr, of the hingeddog t, collar or slide S, either fixed oif"adjustahle, substantially asshown and described.

o'. The arrangement, with Vtreadle-rod Q, of the steadying-bars 3 andhinged dog t, as and for the purposes stated. y

7. The arrangement of the chisel-spindle E, pulley K, catch-lever I, andhand-lever T, reversing-handle l1, and vlatch-pieces u and w,substantially asand for vthe purposes set forth.

8. The arrangement of the sliding or bearing frame B, treadle-rod Q,treadle- R, adjusting-clamp plates .Z W, screw or bolt y, all the partsbeing constructed as shown and described.

9. The arrangement, with frame A, of the mechanismY herein described,for reversiugthe'chisel by power or by hand, asgshown, and -for thepurposes set forth.

D. L. GIBBS.

Witnesses:

Trios. H. DODGE, GHAs. H. BURLEIGH.

